Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 1-95
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Mast Stop Raising And Boom Stop
Mast Stop Raising Cylinders
See Figure 1-60 for the following procedure.
The mast stop raising cylinders pneumatically position the
physical mast stops. Once the physical mast stops are raised
at assembly, the mast stop raising cylinders are pinned to
physical mast stops. See Assembly/Disassembly topic in
Section 4 of MAX-ER 2000 Operator Manual for instructions
on mast assembly/disassembly.
When the engine is started, pressurized air at 120 to 132 psi
(8.2 to 9,1 bar) from crane’s engine compressor provides air
to operate mast stop raising cylinders. An air line from crane
manifold goes to quick disconnect at mast base. After the
quick disconnect there is a tee that splits, with one line going
to mast stop raising cylinders on mast and the other line
going to boom stop cushion cylinders on boom butt. The
mast stop raising cylinder rods extend and push mast stops
to working position. The physical mast stop ends rest on
gantry pins. A fixed restriction at piston end of each cylinder
acts as a cylinder shock cushion.
Boom Stop Cushion Cylinders
See Figure 1-60 for the following procedure.
The boom stop cushion cylinders pneumatically cushion the
boom against the mast when at or near maximum boom
angle.
When engine is started, pressurized air at 120 to 132 psi (8.2
to 9,1 bar) from crane’s engine compressor provides air to
boom stop cushion cylinders. An air line from crane manifold
goes to quick disconnect at mast base. After the quick
disconnect there is a tee that splits, with one line going to
mast stop raising cylinders on mast and the other line going
to boom stop cushion cylinders on boom butt.
If boom is raised to 80 degrees, boom-stop cylinders slow
the boom opposite movement. Check valves prevent
compressed air from escaping boom stop cylinders. Air
pressure increases in boom stop cylinders, slowing the
boom before boom stop struts contact the boom. At
approximately 90 degrees boom-stop cylinders bottom out
and boom physically stops. Orifices of boom stop cylinders
act as shock absorbers for lowered boom struts when
transporting crane.
RM-15
FROM MAIN
AIR MANIFOLD
MANIFOLD
CHECK
VALVE
CHECK
VALVE
RIGHT BOOM
STOP CUSHION
CYLINDER
LEFT BOOM
STOP CUSHION
CYLINDER
RIGHT MAST STOP
RAISING CYLINDER
LEFT MAST STOP
RAISING CYLINDER
QUICK
DISCONNECT
RESTRICTION
RESTRICTION
FIGURE 1-60

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English